Apparatus for the production of profiled pieces showing a lacunar or reticulated structure

Claim 1

AN EXTRUSION MACHINE FOR MANUFACTURING ARTICLES FROM A SOLIDIFIABLE MATERIAL AND HAVING AT LEAST IN PART A NET-LIKE STRUCTURE COMPRISING, EXTRUSION DIE MEANS FOR CONTINUOUSLY EXTRDING A PLURAITY OF ELONGATED GENERALLY PARALLEL STRANDS AND FOR EXRTRUDING OTHER STRANDS AS CONTINUATIONS OF THE FIRST-MENTIONED STRANDS AND SUBSTANTIALLY NORMAL THERETO, SAID EXTRUSION DIE MEANS COMPRISING COAXIAL, ORIFICE-DEFINING MEANS HAVING COAXIAL, COACTIVE SURFACES JOINTLY DEFINING IN A FIRST OPERATIVE POSITION A DISCONTINUOUS EXTRUSION ORIFICE HAVING OBSTRUCTED AREAS AND SPACED, UNOBSTRUCTED AREAS CONTIGUOUS WITH SAID OBSTRUCTED AREAS FOR EXTRUDING SAID FIRST-MENTIONED STRANDS THROUGH SAID UNOBSTRUCTED AREAS, SAID COACTIVE SURFACES BEING AXIALLY MOVABLE RELATIVELY ONE TO THE OTHER TO A SECOND OPERATIVE POSITION WITH SAID SURFACES SPACED AND JOINTLY DEFINING SAID EXTRUSION ORIFICE AS A CONTINUOUS AND UNOBSTRUCTED ORIFICE FOR EXTRUDING SAID OTHER STRANDS THERETHROUGH, AND MEANS ON SAID ORIFICE-DEFINING MEANS TO MOVE SAID SURFACES TO SAID OPERATIVE POSITIONS ALTERNATELY.